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Flight testing using fast online aeroelastic identification techniques with DLR research aircraft HALO

Sinske, Julian and Govers, Yves and Jelicic, G. and Buchbach, Ralf and Schwochow, Jan and Handojo, Vega and Böswald, Marc and Krüger, Wolf R. (2017) Flight testing using fast online aeroelastic identification techniques with DLR research aircraft HALO. In: Proccedings of the International Forum on Aeroelasticity and Structural Dynamics (IFASD 2017). IFASD 2017 - International Forum on Aeroelasticity and Structural Dynamics, 25.-28. Jun. 2017, Como, Italien. ISBN 978-88-97576-28-0

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Abstract

The research aircraft HALO (High Altitude and Long Range Research Aircraft) of the German Aerospace Center (DLR) can be equipped with under-wing stores at different wing positions to transport scientific instruments for atmospheric research. The PMS (Particle Measurement System) carrier is one example of such an external store which can carry three instruments at the same time per wing to detect and count particles of different size (ice, carbon, dust, etc.) in different layers of the atmosphere. Any modification on an aircraft must be investigated numerically and experimentally to ensure the structural integrity and safe operation of the aircraft for all flight conditions. For loads and flutter analyses, flight test data is the essential means for validation. In preparation of the flight test, the airframe and the under-wing stores must be instrumented with acceleration sensors and strain gauges. In order to reduce flight test time and to maintain safety it is important to have tools available that indicate relevant safety margins to support the flight test engineers in making decisions for continuation of cancellation of a flight test. The DLR Institute of Aeroelasticity in Göttingen (Germany) has developed a real-time analysis procedure for online identification of modal parameters like eigenfrequencies, damping ratios and mode shapes. These parameters vary with flight conditions, payload and fuel configuration and must be monitored to assess the aeroelastic stability margin of the system. In a joined flight test campaign, the department of Loads Analysis and Aeroelastic Design and the department of Structural Dynamics and System Identification of the DLR-Institute of Aeroelasticity have tested the newly developed flight test procedure in 14 flight hours using the HALO research aircraft. A network of three distributed data acquisition modules enabled the recording of the flight test instrumentation with 51 accelerometers and 16 strain gauges integrated in Wheatstone bridges. The measured data were distributed online to several computers on which the newly developed software was implemented, allowing an instantaneous analysis of the structural dynamics and dynamic loads in flight. This paper provides an overview of the flight vibration tests (FVT) conducted with HALO. It also shows the capability of the newly developed online monitoring system for aeroelastic identification.

Item URL in elib:https://elib.dlr.de/114154/
Document Type:Conference or Workshop Item (Speech)
Title:Flight testing using fast online aeroelastic identification techniques with DLR research aircraft HALO
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Sinske, Julianjulian.sinske (at) dlr.dehttps://orcid.org/0000-0002-6080-9982
Govers, Yvesyves.govers (at) dlr.dehttps://orcid.org/0000-0003-2236-596X
Jelicic, G.goran.jelicic (at) dlr.dehttps://orcid.org/0000-0001-5091-6699
Buchbach, Ralfralf.buchbach (at) dlr.dehttps://orcid.org/0000-0003-3417-997X
Schwochow, Janjan.schwochow (at) dlr.dehttps://orcid.org/0000-0002-5430-8479
Handojo, Vegavega.handojo (at) dlr.dehttps://orcid.org/0000-0001-6030-2383
Böswald, Marcmarc.boeswald (at) dlr.dehttps://orcid.org/0000-0001-8260-8623
Krüger, Wolf R.wolf.krueger (at) dlr.dehttps://orcid.org/0000-0002-7949-1169
Date:25 June 2017
Journal or Publication Title:Proccedings of the International Forum on Aeroelasticity and Structural Dynamics (IFASD 2017)
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
ISBN:978-88-97576-28-0
Status:Published
Keywords:flight vibration test, online aeroelastic identification
Event Title:IFASD 2017 - International Forum on Aeroelasticity and Structural Dynamics
Event Location:Como, Italien
Event Type:international Conference
Event Dates:25.-28. Jun. 2017
Organizer:Politechnico Milano, Department of Aerospace and Science Technology
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:fixed-wing aircraft
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Flight Physics
Location: Göttingen
Institutes and Institutions:Institute of Aeroelasticity > Structural Dynamics and System Identification
Deposited By: Sinske, Julian
Deposited On:25 Sep 2017 15:32
Last Modified:25 Sep 2017 15:32

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